Edward e



No Modem A. 'R. GAVNER, Deod.

m a m m m, A N A H L 0 H E E LOGOMOTIVE ENGINE. No. 478,684.

Patented-July 12, 1892.

m: mums PETERS (20., Pnomul'nm, WASHINGYON, u. c

. UNITED STATES PATENT FFICE.

ALEXANDER R. CAVN ER, OF CHICAGO, ILLINOIS; EDYVARD E. HOLMAN, AD-

MINISTRATOR OF SAID ALEXANDER R. OAVNER, DECEASED, ASSIGNOR TO THE OAVNER LOCOMOTIVE IMPROVEMENT COMPANY, OF SAME PLACE.

.LOCQMOTlVE-ENGINE.

SPECIFICATION forming part Of Letters Patent NO. 478,684, dated July 12, 1892.

Application filed August 4, 1891. s l No. 401,709. (No model.)

proved apparatus by means of which the draft of the furnace of the locomotive may be greatly improved, and thereby to economize the consumption of fuel.

Another object of my invention is to pro- Vide improved apparatus for heating the wa- 2o ter which is supplied to the boilerbefore it is introduced into the boiler.

I accomplish these objects as hereinafter specified and as illustrated in the drawing.

. That which I regard as new will be pointed out in the claims.

In the drawing, 1 indicates a locomotiveengine having a boiler 2 and a compartment 3 in front of the boiler.

4 indicates ahood, which connects the flues 0 of the boiler with a pipe 5, which extends upward and terminates at the lower portion of the smoke-stack 6 ot the engine. The lower portion of the smoke-stack 6 is enlarged, as shown, to form a chamber, in which the de- 5 vices for heating the water and air are located. 7 7 indicates a partitio'n,which is preferably composed of sheet metal and is placed in the lower portion of the smoke-stack 6 and eX-f tends around said smoke-stack at a short dis tance from its sides, forming a narrow compartment 8 around the central portion of the smoke-stack, as shown.

9 indicates a circular plate or hood, which 5 is connected at its outer edges to the upper portion of the compartment 3 and at its inner end is secured around the pipe 5 to separate the interior of the smoke-stack 6 from thecompartment 3. Apertures 10 are pro-' cation between the compartment 8 and the compartment 3. o a o 11 indicates apertures formed in the lower portion of the smoke-stack 6, which apertures permit of the passage of air into the compartment 8. The apertures 11 are preferably small, and a great number of them is provided, so that a. liberal supply of fresh air may enter the compartment 8.

12 indicates a water-supply pipe, which extends from an injector 13 into the lower portion of the smoke-stack 6, where it is arranged in the form of a coil 14, the lower end of the coil terminating in a pipe 15, which opens into the boiler through acheck-valve 16. The inj I jector 13 and check-valve 16 may be of the usual construction. 7

17 indicates a pipe for conducting water from the tender to the injector 13, which pipe may be arranged in the usual manner.

18 indicates a coil of pipe, which is placed in the lower portion of the smoke-staclgaround the coil 14, and preferably close to the partition 7. The coil 18 may be secured in position in any suitable manner.

19 indicates a pipe for conducting exhauststeam from the cylinders 20 of theloeomotive into the pipe 5, which pipe 19 terminates in the lower portion of the pipe 5. I

21 indicates an exhaust-fan, which is operated by an engine 22 and is adapted to exhaust the air from the compartment 3 and deliver it through a tube 23 into the ash-box 24 of the furnace, substantially as described in one of my former applications.

25 indicates tubes for delivering air from the ash-box 24 into the furnace of the locomotive. The tubes 25 open at their lower ends into the ash-box and extend upward through the furnace to the tire-box of the 10- comotive and terminate near the top of the fire-box. They are provided with apertures 26, through which air is delivered into the furnace. Any desired number of pipes 25 may be used,and they are preferably located at the front and rear portions of the fire-box, as shown. 1

- The operation of my improved apparatus is as follows: When the exhaust-fan 21 is in operation, a supply of air will be drawn down- I00 ward through the apertures 11 into the compartment 8, and will thence pass into the compartment 3 through the apertures 10 in the plate 9. As the air passes through the compartment 8 itwill come in contact with the partition 7 and will pass close to the coil 18 at the interior of the smoke-stack 6. The coil 18 is heated to a high temperaturethrough the action of the hot gases, which pass from the furnace through the fiues of the boiler and are delivered into the lower portion of the smoke-stack, as hereinbefore described. This will bring the air in the chamber 8 toa high temperature, and it will be carried by the exhaust-fan through the pipe 23 and be delivered into the ash-box 24 while still at a high temperature, and will thence be carried through the pipes 25 into the fire-box. The furnace will thereby be fed with a hot-air blast, which will render the combustion of the fuel much more complete, and a great saving of fuel will be effected. When the locomotive is in operation, the exhaust-steam from the cylinders will pass into the tube 19 and will be delivered into the lower portion of the pipe 5, where its expansion will causea draft through the fiues of the boiler, thus producing a draft through the furnace. The water which is supplied to the boiler will pass through the pipe 12 and around the coil 14, where it will be subjected to the heat from the hot gases from the furnace and the exhaust-steam from the cylinders and will be brought to a high temperature before it is introduced into the boiler. By this arrangement the fuel is further economized, as very little further heat will be required to raise the water to the desired temperature after it reaches the boiler.

That which I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a locomotive, of an air-heater arranged in the forward portion thereof, an air-heating compartment arranged in juxtaposition to the heater and wherein the air is heated by such heater, a compartment arranged at the forward portion of the locomotive and having communication with the air-heating compartment, a hood located in said compartmentand connectingthe boilerflues with the smoke-stack, and mechanism which operates to draw external atmosphere into the air-heating compartment and force the same to the locomotive-furnace, substantially as described.

2. The combination, with a locomotive, of an air-heater at the forward portion thereof, an air-compartment separated from the airheater by a perforated partition and in communication with the external atmosphere, a compartment having communication with the air-heating compartment through the said perforated partition, a hood located in said compartment and connecting the boiler-fines with the smoke-stack, and mechanism which operates to draw air into the air-compartment and force the same to the locomotive-furnace, substantially as described.

The combination, with a locomotive, of an air-heater arranged in the forward portion thereof, an air-heating compartment arranged in juxtaposition to the heater and wherein the air is heated by such heater, a compartment arranged at the forward portion of the locomotive and having communication with the air-heating compartment, ahood arranged in said compartment and connectlng the boiler-fines with the smoke-stack, and an exhaust-fan having a pipe connection with the locomotive-furnace and operating to draw external atmosphere into the ainheating compartment and force the same to the locomotive-furnace through said pipe, substantlally as described.

4:. The combination, with a locomotive, of a feed-water and air heater arranged in the forward portion thereof, an air-heating compartment arranged in juxtaposition to the Water and air heater and wherein the air 1s heated by such water, a pipe for conduct ng water to the heater, a pipe for conducting water from the heater to the locomotive-boiler, a compartment arranged at the forward portion of the locomotive and havingcommunication with the air-heating compartment, and mechanism which operates to draw external atmosphere into the air-heating compartment and force the same to the locomotive, substantially as described.

5. The combination, with a locomotive having a boiler 2 and forward compartment 3, having no communication with the bo1ler, 'of a smoke-stack 6, having partition 7, exterior compartment 8, said exterior compartment 8 having apertures 11, plate 9, separating the compartment 3 from the interior of the smokestack, apertures 10 in said plate 9, pipe 23, adapted to conduct air from the compartment 3 to the ash-box of the locomotive, and apparatus located in said compartment 3, adapted to exhaust the air from said compartment and deliver it into the pipe 23, substantially as described.

6. The combination, with alocomotive having a forward compartment, said compartment having no communication with the flues of the locomotive-boiler, and a smoke-stack having an interior compartment in communication with the flues of the boiler and an exterior compartment having apertures adapted to permit of the access of air into said compartment, said exterior compartment being in communication with the forward compartment of the locomotive, of a coil 18 in the interior of the smoke-stack and apparatus for causing a current of air to flow through the compartment 8 into the forward compartment of the locomotive, substantially as and for the purpose specified.

7. The combination, with a locomotive having a boiler 2 and a forward compartment 3, having no communication with the boiler, of

[0 18around said coil 14, tube 19 for delivering exhaust=steam into the smoke-stack, exhaust fan 21, tube23 for conveying air from the.

compartment 3 to the ash-box of the locomotive, and pipes 25, adapted to deliver air from the ash-box into the fire-box of thelocomotive, substantially as described.

ALEXANDER R. CAVNER.

Witnesses: 7

ROBT. B. PORTER, A'. M. MILLER. 

